With 75 years of comic book history to draw upon, CW's flagship show Arrow has successfully adapted a number of fan-favorite storylines with a unique Arrowverse spin that's resonated with audiences worldwide.

Few shows on TV have such an enduring legacy to uphold, which is why every episode is picked apart by viewers. We love to analyse each frame, and construct our own fan theories to explain exactly what's going on in obsessive detail. So check out our best Arrow season 5 theories below!

While not every fan theory turns out to be true, they're fascinating nonetheless, providing a deeper insight into the characters that we all know and love. With that in mind, take a look below at all of the fan theories currently circulating around Arrow Season 5 — and remember to come back regularly as we continue to update this list.

Who Is Prometheus?

[Via The CW]

Now that Prometheus has been unveiled, we're still none the wiser regarding his/her true identity, but the producers have offered a number of clues that suggest we could have seen this mysterious figure before.

Is Black Siren Working With Prometheus?

A new trailer reveals that the resurrected Laurel Lance is actually Black Siren, but what's still unclear is how she escaped the prison in Star Labs. Did Prometheus free the meta-human in order to play mind games with Oliver and Team Arrow?

Was The Huntress Affected By Flashpoint?

[Via The CW]

Mention of the Bertinelli crime family in a recent episode of Arrow suggests that Flashpoint could have changed the origins of the Huntress, a vigilante who had a number of memorable appearances in the first few seasons.

Will Harley Quinn Appear In Season 5 of Arrow?

[Via The CW]

Show runner Greg Berlanti explains how Warner Bros. asked his team to test out the Suicide Squad characters on TV before tackling the team on the big screen. Does this mean Harley Quinn could return in Season 5 of Arrow?

Will The Spectre Appear In Arrow Season 5?

[Via The CW]

One particularly interesting Arrow Season 5 theory concerns DC's most prominent supernatural entity, The Spectre. People began to suspect that this iconic character could appear on Arrow after director James Bamford tweeted this cryptic message:

Green Lantern Will Appear In Season 5 Of Arrow — As A Villain

[Via The CW]

Fans have been clamouring to see Hal Jordan appear in the Arrowverse ever since the hero's hometown Coast City was first introduced as an Easter Egg in earlier seasons. Despite the fact that numerous references since have suggested Green Lantern could appear on Arrow one day, executives have now shot down this rumor completely. However, there's still a chance that the character could appear in DC's Legends of Tomorrow instead.

Remember to check back regularly as we continue to update this overview with the very best Arrow fan theories that the internet has to offer. In the meantime, check out this promo for Arrow Season 5 for clues on which direction the show will take next.

Which one of these Arrow Season 5 theories do you think could be true? Let us know in the comments!

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